Submission #1046609

#	Time	Username	Problem	Language	Result	Execution time	Memory
1046609		Newtonabc	Knapsack (NOI18_knapsack)	C++14	73 / 100	1036 ms	17100 KiB

knapsack

#include<bits/stdc++.h>
using namespace std;
const int N=2e3+10;
vector<pair<long long,long long> > v;
int dp[N];
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int s,n;
	cin>>s >>n;
	while(n--){
		long long a,b,c,sum=0;
		cin>>a >>b >>c;
		long long tmp=1;
		while(c>=tmp){
			if(b*tmp>s) break;
			v.push_back(make_pair(a*tmp,b*tmp));
			c-=tmp;
			tmp*=2;
		}
		if(b*c<=s) v.push_back(make_pair(a*c,b*c));
	}
	for(int i=0;i<v.size();i++){
		long long val=v[i].first,wg=v[i].second;
		for(int j=s;j>=1;j--){
			if(j-wg<0) break;
			dp[j]=max(dp[j],dp[j-(int)wg]+(int)val);
		}
	}
	cout<<dp[s];
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:12:19: warning: unused variable 'sum' [-Wunused-variable]
   12 |   long long a,b,c,sum=0;
      |                   ^~~
knapsack.cpp:23:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |  for(int i=0;i<v.size();i++){
      |              ~^~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 17 / 17
• Subtask 3: 20 / 20
• Subtask 4: 24 / 24
• Subtask 5: 0 / 27